ardupilot/libraries/AP_RangeFinder/AP_RangeFinder_USD1_CAN.h

#pragma once

#include "AP_RangeFinder_Backend.h"
#include <AP_CANManager/AP_CANSensor.h>

#ifndef AP_RANGEFINDER_USD1_CAN_ENABLED
#define AP_RANGEFINDER_USD1_CAN_ENABLED (HAL_MAX_CAN_PROTOCOL_DRIVERS && AP_RANGEFINDER_BACKEND_DEFAULT_ENABLED)
#endif

#if AP_RANGEFINDER_USD1_CAN_ENABLED

class USD1_MultiCAN;

class AP_RangeFinder_USD1_CAN : public AP_RangeFinder_Backend {
public:
    friend class USD1_MultiCAN;

    AP_RangeFinder_USD1_CAN(RangeFinder::RangeFinder_State &_state, AP_RangeFinder_Params &_params);

    void update() override;

    // handler for incoming frames
    bool handle_frame(AP_HAL::CANFrame &frame);

    static const struct AP_Param::GroupInfo var_info[];


protected:
    virtual MAV_DISTANCE_SENSOR _get_mav_distance_sensor_type() const override {
        return MAV_DISTANCE_SENSOR_RADAR;
    }
private:
    float _distance_sum;
    uint32_t _distance_count;
    int32_t last_recv_id = -1;

    AP_Int32 receive_id;

    static USD1_MultiCAN *multican;
    AP_RangeFinder_USD1_CAN *next;
};

// a class to allow for multiple USD1_CAN backends with one
// CANSensor driver
class USD1_MultiCAN : public CANSensor {
public:
    USD1_MultiCAN() : CANSensor("USD1") {
        register_driver(AP_CANManager::Driver_Type_USD1);
    }

    // handler for incoming frames
    void handle_frame(AP_HAL::CANFrame &frame) override;

    HAL_Semaphore sem;
    AP_RangeFinder_USD1_CAN *drivers;
};

#endif  // AP_RANGEFINDER_USD1_CAN_ENABLED